Hi!
Unfortunately I have found a bug in simpsum (it seems):
(C1) 'SUM(BINOMIAL(2,2-k)-BINOMIAL(2,1-k),k,1,2),simpsum;
(D1) 3
***************** wrong **********************
(C2) 'SUM(BINOMIAL(2,2-k)-BINOMIAL(2,1-k),k,1,2),sum;
(D2) 2
***************** correct ********************
***************** however : ******************
(C3) 'SUM(BINOMIAL(x,2-k)-BINOMIAL(x,1-k),k,1,2),simpsum;
(D3) x
(C4) 'SUM(BINOMIAL(x,2-k)-BINOMIAL(x,1-k),k,1,2),sum;
(D4) x
(C5) bug_report();
The Maxima bug database is available at
http://sourceforge.net/tracker/?atid=104933&group_id=4933&func=browse
Submit bug reports by following the 'Submit New' link on that page.
Please include the following build information with your bug report:
-------------------------------------------------------------
Maxima version: 5.9.0rc1
Maxima build date: 11:40 9/3/2002
host type: i686-pc-linux-gnu
lisp-implementation-type: Kyoto Common Lisp
lisp-implementation-version: GCL-2-5.0
-------------------------------------------------------------
Martin